EP3878712B1 - Motorisierte schubkarre - Google Patents

Motorisierte schubkarre Download PDF

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Publication number
EP3878712B1
EP3878712B1 EP20215103.1A EP20215103A EP3878712B1 EP 3878712 B1 EP3878712 B1 EP 3878712B1 EP 20215103 A EP20215103 A EP 20215103A EP 3878712 B1 EP3878712 B1 EP 3878712B1
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EP
European Patent Office
Prior art keywords
wheelbarrow
wheelbarrow according
wheel
frame
container
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP20215103.1A
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English (en)
French (fr)
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EP3878712A1 (de
EP3878712C0 (de
Inventor
Marko Makarovic
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Blockhapp Razvoj In Svetovanje d o o
Original Assignee
Blockhapp Razvoj In Svetovanje d o o
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
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Publication of EP3878712A1 publication Critical patent/EP3878712A1/de
Application granted granted Critical
Publication of EP3878712C0 publication Critical patent/EP3878712C0/de
Publication of EP3878712B1 publication Critical patent/EP3878712B1/de
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62B—HAND-PROPELLED VEHICLES, e.g. HAND CARTS OR PERAMBULATORS; SLEDGES
    • B62B1/00—Hand carts having only one axis carrying one or more transport wheels; Equipment therefor
    • B62B1/18—Hand carts having only one axis carrying one or more transport wheels; Equipment therefor in which the load is disposed between the wheel axis and the handles, e.g. wheelbarrows
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62B—HAND-PROPELLED VEHICLES, e.g. HAND CARTS OR PERAMBULATORS; SLEDGES
    • B62B5/00—Accessories or details specially adapted for hand carts
    • B62B5/0026—Propulsion aids
    • B62B5/0069—Control
    • B62B5/0073—Measuring a force
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62B—HAND-PROPELLED VEHICLES, e.g. HAND CARTS OR PERAMBULATORS; SLEDGES
    • B62B5/00—Accessories or details specially adapted for hand carts
    • B62B5/0026—Propulsion aids
    • B62B5/0033—Electric motors
    • B62B5/0036—Arrangements of motors
    • B62B5/004—Arrangements of motors in wheels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62B—HAND-PROPELLED VEHICLES, e.g. HAND CARTS OR PERAMBULATORS; SLEDGES
    • B62B5/00—Accessories or details specially adapted for hand carts
    • B62B5/0026—Propulsion aids
    • B62B5/0033—Electric motors
    • B62B5/0053—Arrangements of batteries
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62B—HAND-PROPELLED VEHICLES, e.g. HAND CARTS OR PERAMBULATORS; SLEDGES
    • B62B5/00—Accessories or details specially adapted for hand carts
    • B62B5/0026—Propulsion aids
    • B62B5/0033—Electric motors
    • B62B5/0056—Energy recuperation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62B—HAND-PROPELLED VEHICLES, e.g. HAND CARTS OR PERAMBULATORS; SLEDGES
    • B62B5/00—Accessories or details specially adapted for hand carts
    • B62B5/0026—Propulsion aids
    • B62B5/0069—Control
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62B—HAND-PROPELLED VEHICLES, e.g. HAND CARTS OR PERAMBULATORS; SLEDGES
    • B62B5/00—Accessories or details specially adapted for hand carts
    • B62B5/0026—Propulsion aids
    • B62B5/0079—Towing by connecting to another vehicle
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62B—HAND-PROPELLED VEHICLES, e.g. HAND CARTS OR PERAMBULATORS; SLEDGES
    • B62B5/00—Accessories or details specially adapted for hand carts
    • B62B5/04—Braking mechanisms; Locking devices against movement
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62B—HAND-PROPELLED VEHICLES, e.g. HAND CARTS OR PERAMBULATORS; SLEDGES
    • B62B5/00—Accessories or details specially adapted for hand carts
    • B62B5/06—Hand moving equipment, e.g. handle bars
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62B—HAND-PROPELLED VEHICLES, e.g. HAND CARTS OR PERAMBULATORS; SLEDGES
    • B62B2301/00—Wheel arrangements; Steering; Stability; Wheel suspension
    • B62B2301/12—Wheel arrangements; Steering; Stability; Wheel suspension comprising counterbalancing means to increase stability

Definitions

  • the present invention relates to a wheelbarrow, such as a single-wheeled transport trolley with manual push, and in particular to a wheelbarrow provided with an electric motor having an electric motor to assist in moving the wheelbarrow.
  • a wheelbarrow such as a hand-pushed single-wheeled transport trolley, is well passable on narrow paths and is often used to transport materials, parts, harvest or fertilizer in workplaces, fields, orchards, mountains or forests.
  • a wheelbarrow needs to be pushed by hand, manipulating it on poorly maintained paths, meadows or steep slopes is difficult, so the scope of its use is limited.
  • When manipulating the wheelbarrow it is necessary to push or brake, maintain forward/backward balance and left/right balance. Transporting goods on rough terrain is therefore often difficult, especially for occasional users such as amateur workers maintaining courtyards, houses, gardens and amateur food growers.
  • the need to use a wheelbarrow at a remote location often arises.
  • Patent WO1992007747A1 proposes a solution to the forward/backward weight balance, in which all drive elements and part of the load space are placed above the wheel axle.
  • EP0867353A2 proposes an intuitive solution to controlling including a movable handle.
  • the left/right weight balance is solved by placing the batteries in different positions of the frame.
  • US2002/0084119A1 solves the weight balance by integrating the motor into the wheelbarrow wheel and the battery under the container.
  • DE202012009715U1 solves the weight balance by integrating the motor and batteries into the wheelbarrow wheel.
  • US 2017/225700 A1 (Snyder ) describes a power assisted wheelbarrow having a gyroscopically-responsive power assisted moment arm.
  • a moment arm extends to a pivot point such that when a longitudinal force is applied at the moment arm, a sensor senses such force and outputs an energizing signal to a motor to drive a wheel. If a rotational or vertical force is applied to the moment arm, the motor need not be driven.
  • a power assist can be provided to a user to drive a wheel in a desired direction of transport while not causing drive during tipping or unloading of the load carrying portion of the vehicle.
  • EP 0913311 A1 (Miyazaki, et al ) describes a motor-assisted single-wheel cart which is provided with a motor for generating an assisting power in response to an operation force when operating an operation handle by a human hand, and a power transmission mechanism for transmitting an output of the motor to an axle.
  • the motor is arranged rearwardly upwardly of the axle so as to be positioned within a space surrounded by an upper horizontal member and a lower member positioned below the upper horizontal member constituting a vehicle body frame constituting the cart when viewing the vehicle body frame from a side surface thereof.
  • the power transmission mechanism has a first speed reduction mechanism arranged near the motor, a second speed reduction mechanism arranged near the wheel and a transmission shaft for connecting them.
  • the transmission shaft is inserted to the first and second speed reduction mechanisms so as to be capable of being drawn out.
  • Known battery placement solutions position the battery in a way that the centre of gravity of the battery is above the neutral axis, which raises the total centre of gravity even further from the neutral axis.
  • the invention is based on the background described so far and aims to provide a single-wheel transport trolley with manual push, in which the auxiliary force of the electric motor acts effectively on the wheel to reduce the required force exerted by arms, while reducing battery power consumption and weight balance around the neutral axis is similar to that of a non-motorized wheelbarrow.
  • the wheelbarrow should be intuitively manageable and easy to transport, and its stored energy and unoccupied volume should also be used for other purposes.
  • a wheelbarrow with an electric drive which comprises: a frame for a container; a wheel mounted in the middle of the lower part of the frame of the container; right and left handle supports extending backwards from two sides of the frame for the container; a left and right leg, which are an integral part of the frame; an electric motor mounted in said wheel, which drives or brakes the wheelbarrow only when necessary; two separate batteries mounted in a protective housing attached to said legs; two handles overlapping to a limited extent said pair of supports which are fixed with respect to said supports; a contactless sensor for detecting the position of a hand that is attached to one of said handle supports; a multi-axis acceleration sensor rigidly connected to said frame, buttons accessible by a finger while simultaneously holding said handles; and a control system for monitoring the operation of said electric motor based on motor controller information, detected values of sensors for detecting the position of the user's hand, wheelb
  • the pushing forces acting on the handles are detected via a small movement of the hands in the forward/backward direction.
  • the hand position sensor transmits a signal to the wheelbarrow controller so that the motor can drive the wheelbarrow according to push forces and manual work can be reduced, so a fully loaded wheelbarrow can be pushed onto a rough or gravel surface.
  • the energy consumption of the battery can be reduced by not activating the electric motor.
  • the wheelbarrow is pushed by lifting the handles and then the pushing force acts on the handles.
  • the position of the frame of the container may become unstable. Loss of balance is often further caused by the push of the grip of the handle on one side.
  • the hand displacement sensor can detect the push forces that need to be applied to the grip in order to apply the correct traction force to the wheel.
  • the position of compact separate batteries allows for an optimal compromise between left/right and forward/backward balance, greater stability and easier manipulation with the container fully loaded or empty.
  • the choice of modem batteries allows for a suitable compact installation and ensures great autonomy of operation.
  • the battery installation method provides user protection against possible explosion of the battery and at the same time protects the battery from mechanical damage. Placing the battery in the housing, which is an integral part of the legs of the support frame, allows adequate cooling of the batteries and preserves the space under the container for the attachment of other electrical devices.
  • Short overall length of the wheelbarrow and flanges built into the legs of the support frame for attaching the transport support contribute to an easy transport of the wheelbarrow on a towing hitch of a passenger car.
  • the wheel 1 comprises a wheel rim and a built-in motor 26, and is attached via a shaft to a wheel support 14 via a preferably form-fit connection.
  • the rim is adapted to tubeless tyres having dimensions 3.00-10.
  • the support frame 2 is preferably made of a steel tube, preferably of round cross-section.
  • the support legs 3 are preferably made of a curved steel L-profile and are preferably welded to the support frame 2.
  • the plastic handles 4 are preferably round in shape and preferably glued to the tube of the support frame 2.
  • the container 5 is preferably made of sheet steel and is preferably welded to the support frame 2 via supports 13 and 17.
  • the shield 6 of the hand movement sensor is preferably circular in shape and preferably welded to the support frame 2, preferably positioned on the underside.
  • the button 7 is - preferably via an intermediate flange - preferably welded to the support frame 2, preferably positioned so that its upper edge does not reach the upper point of the support frame 2 at this point in height.
  • the battery housing 8 is preferably made of sheet steel and is preferably welded to the supported legs 3. It is configured in a way to form, together with the battery housing cover 19, an enclosed space of such a size that it embraces the battery together with the surrounding damping element, which preferably at the same time provides good thermal conductivity.
  • the control unit housing 9 is preferably made of sheet steel and preferably encloses the power motor controller and the wheelbarrow controller in a watertight manner.
  • the control unit housing 9 is preferably attached to the support 13 via cylindrical damping elements 16 by a screw connection.
  • the cooling part 10 of the power motor controller has free access to the environmental air so as to provide sufficient cooling.
  • the two mounting flanges 11 of the supporting legs with a form-fit connection preferably with a rectangular cut-out, allow for adequate rigidity of the connection with the support for connection to the towing hitch.
  • the protective tube 12 is preferably made of a curved steel tube and is preferably welded on one side to the battery housing 8 and on the other side to the support 13.
  • the support 13 is preferably made of sheet steel and is preferably welded to the support frame 2.
  • the wheel support 14 is preferably made of sheet steel and is preferably welded to the support frame 2.
  • the tyre 15 is preferably a winter tyre for scooters.
  • the elastic damping element 16 is preferably fastened by a screw connection to the control unit housing 9 and the support 13, and is dimensioned to prevent the transmission of shocks from the support frame 2 to the control unit housing 9.
  • the support 17 is preferably made of sheet steel and connects the rear part of the container 5 with the rear part of the support frame 2 preferably via a welded joint.
  • the support 18 is preferably made of a curved steel bar and connects the front part of the container 5 with the front part of the support frame 2 preferably via a welded joint.
  • the battery housing cover 19 is preferably made of sheet steel and is preferably fastened to the battery housing 8 with a screw connection.
  • the neutral axle 20 extends from the grip of the hand with the handle to the junction of the tyre with the ground.
  • the goal of balancing the wheelbarrow left/right is to keep the centre 22 of gravity of the wheelbarrow as close to the neutral axis 20 as possible.
  • the thread pattern of the tyre includes a number of grooves 23 mimicking winter tyres.
  • the mounting position of the wheel 1 allows the connection of various devices, preferably a flange of a towing winch.
  • the motor 26 is preferably a brushless DC motor and preferably transmits torque directly to the wheel shaft.
  • the motor controller is preferably a controller used to control electric scooters.
  • the wheelbarrow controller is preferably based on a 32-bit microcontroller and preferably has a built-in voltage converter to supply power from a preferably 48 V battery.
  • the wheelbarrow controller receives signals from the sensors and the motor controller.
  • the hand position sensor detects the position of the user's hand and transmits information to the wheelbarrow controller.
  • the hand position sensor is mounted in the shield 6 of the sensor via a damping element 16.
  • the button 7 is preferably a push-button switch 7 and is connected via conductors, which are disposed preferably in a tube of a support frame, to the wheelbarrow controller.
  • the wheelbarrow controller changes the operating mode and emergency stop preferably based on different sequences of button pushes. Based on the axial movement of the arm, the wheelbarrow controller calculates the pushing or pulling force of the arms on the handles.
  • the wheelbarrow controller controls the motor controller preferably via a software-implemented PID control mode.
  • the batteries 28 are preferably formed of lithium cells and preferably have a built-in monitoring system.
  • the batteries 28 preferably include a temperature sensor and provide temperature-related information to the wheelbarrow controller.
  • the accelerometer preferably transmits acceleration data in three directions to the wheelbarrow controller.
  • the gyroscope preferably transmits data on rotation about three axes to the wheelbarrow controller.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Handcart (AREA)

Claims (16)

  1. Per Elektromotor angetriebene Schubkarre, umfassend:
    einen Behälter (5);
    einen Rahmen (2) für den Behälter (5);
    ein Rad (1), das in der Mitte des unteren Teils des Rahmens (2) des Behälters (5) montiert ist;
    ein Paar von rechten und linken Griffstützen (25), die sich von zwei Seiten des Rahmens (2) des Behälters (5) nach hinten erstrecken;
    ein Paar von linken und rechten Streben (3), die ein integraler Teil des Rahmens (2) sind;
    einen in dem Rad (1) montierten Elektromotor (26), der dazu geeignet ist, die Schubkarre nur bei Bedarf anzutreiben oder abzubremsen;
    zwei Griffe (4);
    einen berührungslosen Sensor (27) zum Detektieren der Position einer Hand, die an einer der Griffstützen (25) angebracht ist;
    und
    ein Steuersystem, das zum Überwachen des Betriebs des Elektromotors (26) basierend auf Motorsteuerungsinformationen, detektierten Werten von Sensoren zum Detektieren der Position der Hand des Benutzers, einer Schubkarrenposition und Ermöglichen einer Auswahl unterschiedlicher Betriebsmodi gemäß der Abfolge eines Drückens einer Taste geeignet ist.
    gekennzeichnet durch
    zwei separate Batterien (28), die in einem Schutzgehäuse (8) montiert sind, das an den Streben (3) angebracht ist;
    wobei die zwei Griffe (4) in einem begrenzten Ausmaß das Paar von Griffstützen (25) überlagern und in Bezug auf die Griffstützen (25) fixiert sind;
    einen mehrachsigen Beschleunigungssensor (29), der starr mit dem Rahmen (2) verbunden ist,
    Knöpfe (7), die durch einen Finger während eines gleichzeitigen Haltens der Griffe (4) zugänglich sind.
  2. Schubkarre nach Anspruch 1, wobei das Steuersystem dazu geeignet ist, eine Rückmeldung zu dem ausgewählten Betriebsmodus über unterschiedliche Abfolgen einer Radbewegung vorwärts und rückwärts bereitzustellen.
  3. Schubkarre nach Anspruch 1, wobei das Steuersystem dazu geeignet ist, basierend auf den Daten von den Sensoren die Detektion einer Kadenz von Schritten zu ermöglichen, und die Leistung des Antriebs innerhalb des Schritts entsprechend anpasst.
  4. Schubkarre nach Anspruch 3, wobei das Steuersystem dazu geeignet ist, die Detektion von Ungleichmäßigkeiten zwischen linken und rechten Schritten zu ermöglichen, und die Leistung des Antriebs abhängig von den linken und rechten Schritten entsprechend anpasst.
  5. Schubkarre nach Anspruch 1, wobei das Steuersystem dazu geeignet ist, Radschlupf, vorzugsweise durch Vergleichen der Beschleunigung des Rads mit der Beschleunigung der Schubkarre zu detektieren, auf der Basis dessen es bei Bedarf das Motordrehmoment reduziert.
  6. Schubkarre nach Anspruch 1, wobei das Steuersystem dazu geeignet ist, eine redundante Steuerung zu ermöglichen, wobei in dem Fall, dass das System eine Unlogik an einem Eingangssignal im Vergleich zu mindestens zwei anderen Eingangssignalen detektiert, es automatisch in den Bereitschaftsmodus geschaltet wird.
  7. Schubkarre nach Anspruch 1, wobei das Steuersystem dazu geeignet ist, eine Kommunikation, vorzugsweise eine drahtlose Kommunikation, mit anderen Vorrichtungen zu ermöglichen.
  8. Schubkarre nach Anspruch 1, wobei die Batterien derart angeordnet sind, dass ihr Schwerpunkt unterhalb einer Achse, die den Griffpunkt der Hände mit dem Kontaktpunkt des Rades mit dem Boden verbindet, vorzugsweise so tief wie möglich liegt.
  9. Schubkarre nach Anspruch 1, umfassend ein Befestigungssystem zum Befestigen an einer Anhängerkupplung, vorzugsweise mit einer Anbringung, die ein leichtes Befestigen und Entfernen des Befestigungssystems ermöglicht, die an der Anhängerkupplung angebracht bleiben kann.
  10. Schubkarre nach Anspruch 9, umfassend einen elektrischen Stecker an dem elektrischen Verbindungskabel zum Laden der Schubkarrenbatterien von einem Anhänger über eine Typensteckdose.
  11. Schubkarre nach Anspruch 1, wobei ein Steuerungsgehäuse dazu ausgestaltet ist, gleichzeitig ein Lautsprechergehäuse für eine Klangwiedergabe zu bilden.
  12. Schubkarre nach Anspruch 1, die Anbringungspunkte, vorzugsweise an dem Behälterrahmen, aufweist, die es ermöglichen, einen externen Lautsprecher, vorzugsweise einen aktiven, an dem Behälter anzubringen, und vorzugsweise ihn mit den Batterien der Schubkarre zu versorgen.
  13. Schubkarre nach Anspruch 1, die eine Standard-12V-Fahrzeugsteckdose aufweist, die in ein Steuerungsgehäuse eingebaut ist.
  14. Schubkarre nach Anspruch 1, die einen eingebauten Standard-12V-Fahrzeugstecker mit einer Verlängerung aufweist, der ein Laden in 12V-Fahrzeugsteckdosen über einen eingebauten Spannungspegelwandler ermöglicht.
  15. Schubkarre nach Anspruch 14, die ein spiralförmiges Verlängerungskabel aufweist, das vorzugsweise länger als 1 m und dazu geeignet ist, während einer Nichtbenutzung in dem Rahmen gelagert zu werden,.
  16. Schubkarre nach Anspruch 1, wobei ein Reifenprofil aus einer Anzahl von Nuten besteht, vorzugsweise identisch zu dem Profil von Winterreifen für Motorräder.
EP20215103.1A 2020-03-13 2020-12-17 Motorisierte schubkarre Active EP3878712B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SI202000048A SI25808A (sl) 2020-03-13 2020-03-13 Samokolnica s pogonom

Publications (3)

Publication Number Publication Date
EP3878712A1 EP3878712A1 (de) 2021-09-15
EP3878712C0 EP3878712C0 (de) 2023-06-07
EP3878712B1 true EP3878712B1 (de) 2023-06-07

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Family Applications (1)

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EP20215103.1A Active EP3878712B1 (de) 2020-03-13 2020-12-17 Motorisierte schubkarre

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US (1) US20210284222A1 (de)
EP (1) EP3878712B1 (de)
SI (1) SI25808A (de)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20210061329A1 (en) * 2017-07-28 2021-03-04 Iordanis Giannopoulos Hand Propelled Cart

Family Cites Families (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE467661B (sv) 1990-10-30 1992-08-24 Lars Hillbohm Motoriserad skottkaerra
JP3819525B2 (ja) 1997-03-28 2006-09-13 本田技研工業株式会社 補助動力付き歩行型運搬車
US6173799B1 (en) * 1997-10-27 2001-01-16 Honda Giken Kogyo Kabushiki Kaisha Motor-assisted single-wheel cart
US20020084119A1 (en) 2000-12-29 2002-07-04 Florian Brabetz Motorized wheelbarrow
US20020148658A1 (en) * 2001-04-13 2002-10-17 Shu-Hsien Li Power driving device of cart
US6409273B1 (en) * 2001-06-18 2002-06-25 Jeffery D. Campbell Tracked motorized carrier with accessory attachment drive
US7472917B2 (en) * 2005-10-14 2009-01-06 Loudon Kevin D Wheelbarrow trailer
US20130162396A1 (en) * 2011-12-22 2013-06-27 National Kaohsiung University Of Applied Sciences Automatically Controllable Smart Stroller or Wheelchair
CN102582667A (zh) * 2012-03-21 2012-07-18 西南大学 一种独轮车
DE202012009715U1 (de) 2012-10-11 2012-11-15 Walter Meinl Elektrisch betriebene Motorschubkarre
JP2014230681A (ja) * 2013-05-30 2014-12-11 船井電機株式会社 パワーアシスト装置及び歩行補助車
DE112014004677T5 (de) * 2013-10-11 2016-07-21 Murata Manufacturing Co., Ltd. Schiebewagen
WO2015154046A1 (en) * 2014-04-04 2015-10-08 Superpedestrian, Inc. Systems, methods, and devices for the operation of electrically motorized vehicles
US10625818B2 (en) * 2015-09-17 2020-04-21 Nidec Corporation Power assist device, and vehicle equipped with said power assist device
US10093337B2 (en) * 2016-02-05 2018-10-09 Secure Information Devices Inc. Gyroscopically-responsive power assisted moment arm for load carrying devices including pivotal load carrying devices
JP6864488B2 (ja) * 2017-01-31 2021-04-28 株式会社マキタ 手押し式電動運搬車
DE102017208354A1 (de) * 2017-05-18 2018-11-22 Robert Bosch Gmbh Elektromotorisch angetriebene Radvorrichtung
US20200189639A1 (en) * 2018-12-18 2020-06-18 Keith Keoraj Interchangeable motorized utility vehicle assembly

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Publication number Publication date
EP3878712A1 (de) 2021-09-15
US20210284222A1 (en) 2021-09-16
EP3878712C0 (de) 2023-06-07
SI25808A (sl) 2020-09-30

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